Analog to Digital Converter (ADC)
Description:
Because the digital comparator uses current and previous ADC values, this function is provide
to allow the comparator to be reset to its initial value to prevent stale data from being used
when a sequence is enabled.
Returns:
None.
5.2.1.8 ROM_ADCHardwareOversampleConfigure
Configures the hardware oversampling factor of the ADC.
Prototype:
void
ROM_ADCHardwareOversampleConfigure(uint32_t ui32Base,
uint32_t ui32Factor)
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_ADCTABLE is an array of pointers located at ROM_APITABLE[5].
ROM_ADCHardwareOversampleConfigure is a function pointer located at
ROM_ADCTABLE[14].
Parameters:
ui32Base is the base address of the ADC module.
ui32Factor is the number of samples to be averaged.
Description:
This function configures the hardware oversampling for the ADC, which can be used to provide
better resolution on the sampled data. Oversampling is accomplished by averaging multiple
samples from the same analog input. Six different oversampling rates are supported; 2x,
4x, 8x, 16x, 32x, and 64x. Specifying an oversampling factor of zero will disable hardware
oversampling.
Hardware oversampling applies uniformly to all sample sequencers. It does not reduce the
depth of the sample sequencers like the software oversampling APIs; each sample written into
the sample sequence FIFO is a fully oversampled analog input reading.
Enabling hardware averaging increases the precision of the ADC at the cost of throughput. For
example, enabling 4x oversampling reduces the throughput of a 250 Ksps ADC to 62.5 Ksps.
Returns:
None.
5.2.1.9 ROM_ADCIntClear
Clears sample sequence interrupt source.
Prototype:
void
ROM_ADCIntClear(uint32_t ui32Base,
uint32_t ui32SequenceNum)
April 8, 2013 41
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